Means for burning a liquid fuel

Abstract

Waste liquor obtained when pulping wood can be advantageously burned and used for raising steam, while simultaneously chemicals are reclaimed. Certain waste liquors have a noted tendency to cause deposits in valves and piping, which therefore must be intermittently washed by a neutral fluid. This means an interruption of the supply of fuel to the burner, and even if a furnace usually is provided with several burners the interruption causes a disturbance of the steam production, beside necessitating a considerable amount of labor. The invention proposes a means for supplying liquid fuel and washing fluid simultaneously to each burner by two parallel conduits in such a manner that a simple switch-over will result in the (occasional past) supply conduit and the major part of the burner will be washed, while liquid fuel is supplied through a conduit having recently been washed.

What I claim is: 
     
       1. In a means for burning a liquid fuel of the kind having a tendency to cause deposits, said means including a first storage tank for the liquid fuel, a second storage tank for a washing fluid, at least one burner having a head and an elongated lance body attached thereto, two main supply conduits running from the two storage tanks to said burner, and valve means for connecting at will the said main supply conduits to said storage tanks in such a manner that any of said supply conduits will convey liquid fuel, while the other supply conduit simultaneously conveys washing fluid, the improvement that the burner head is connected to the two main supply conduits and includes two three-way valves fitted adjacent to the lance body, as well as a return flow conduit for the washing fluid, the arrangement permitting the lance body to be connected to the main conduit momentarily supplying fuel by way of one of the three-way valves, while the other three-way valve connects the second main supply conduit, momentarily transporting the washing liquid, with the return flow conduit.